Doom 95

Doom 95 cheat codes: 
Network cheat mode:
Hold [Alt] and type iddtiddtiddtiddt in map mode.

Deathmatch cheat mode:
Type t in the map to enter talk mode. Hold [Alt] and
type iddt several times. This will reveal the entire map.
Repeat the code to reveal all items. Repeating the code
again will return the map to normal.

Cheat mode:
Enter one of the following codes during game play

Effect                                    Code
Invincibility                           - iddqd
All weapons, keys, ammo, and 200% armor - idkfa
Reset ammunition                        - idfa
Berserker strength                      - idbeholds
Temporary invincibility                 - idbeholdv
Temporary invisibility                  - idbeholdi
Full automap                            - idbeholda
Anti-radiation suit                     - idbeholdr
Light amplification visor               - idbeholdl
Walk through walls                      - idclip
Chainsaw                                - idchoppers
Level select                            - idclev
Toggle full map; full map and
objects; normal map                     - iddt
Display coordinates and heading         - idmypos
Change music to indicated level         - idmus
Kill all enemies in level               - fhhall
Invisible to enemies until attack       - fhshh